PASADENA, Calif. (KABC) — The 210 Freeway was backing up for miles in Pasadena after a collision between trucks knocked a mobile building onto the roadway.

The incident happened just before 7 p.m. on the westbound 210 near Lake Avenue.

The modular structure – either a mobile home or an office trailer – was on the freeway blocking multiple lanes. A big rig also appeared to be involved in the collision as well as an SUV with front-end damage.

A Sigalert was launched as four westbound lanes were closed for an unknown duration. Traffic was allowed to bypass the scene via a single lane.

CHP officers were attempted to divert traffic at Lake.